Milter-greylist

Hi.

I have bastion MX servers which relay incoming messages after appropriate
checks (virus, spam, standards, and greylist), but also relay outgoing
messages to the Internet from my internal network; among other things these
servers use milter-greylist.

Today, one of my users said something to me that really made me think.

  "If I send a message to someone on the Internet, then I should really
   accept mail from that address -- anybody I send a message to should be
   whitelisted, at least for some period of time."

Assuming sender@... sends a message to recipient@...,
it seems like the moral equivalent of:

 racl whitelist from recipient@... rcpt sender@...

should automatically just happen, with some configurable timeout on the
rule... ideally, in a format that the MX sync function would recognize.

This would be an action based on just the inverted sender-recipient pair,
rather than a sender-recipient-sendingIP tuple.  What it comes down to is
that there's a reasonable argument, to me, that sending a message to an
address grants permission to that address to send mail to me for some
period of time.

So... this is first a request for a sanity check and, if sane, a feature
request.  I'm willing to work on it, but really don't understand the code
to milter-greylist particularly well.  I do have more reading to do, of
course....


	-Bill
-- 
William Yang, CISSP
William.Yang@...